只要大声笑,烦恼都丢掉。我的「青春」似乎比别人稍微漫长,因为从某天开始,除了我之外,周围的时间全都停止了。下午1点35分,每天固定造访的伤停补时,限时1小时。在这段时间裡, 我爱上了和我看著相同景色的她──篠宫时音,琥珀色眼瞳带着不可思议魅力的少女。但她身上似乎有个「唯独我」没有发现的重大秘密……。A monster stalks the corridors of an abandoned mansion, targeting those curious enough to find themselves inside. Two friends break in and discover that all exits have been sealed off. The creature that hunts them is growing hungry for their blood and there is no escape…。